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-Analysis of Thermal and Magnetic Properties by
Fe/Co ratio to Fe-based Amorphous Alloys
Seoyeon Kwon* and Haein Choi-Yim
Department of Physics, Sookmyung Women’s University, Seoul 04310, Republic of Korea
1. Introduction
Fe-based amorphous alloy systems have attracted interest for the low material cost, and good soft magnetic properties [1-3]. Particularly, improving the soft magnetic properties and glass forming ability of Fe-based amorphous alloy systems has been studied for the several applications [4,5]. These (Co, Fe)-B-Si alloy system was developed in 1974 and used in field of application development for its good soft magnetic properties and high-strength compared with other Fe-B-Si systems [6,7]. Therefore, we have selected this system. Adding Mo in the Fe-B-Si systems enhances glass-forming ability (GFA) and thermal stability. In this study, we researched on effects of replacing Co by Fe and the part of small Mo additions, in Fe-Co-B-Si-Mo alloy system. We examined the thermal and magnetic properties of (Co1-xFex)72B19.2Si4.8Mo4 (0≤x≤1) by amorphous ribbons in detail.
2. Experiment
(Co1-xFex)72B19.2Si4.8Mo4 (0≤x≤1) alloys were prepared by an arc-melting furnace with high purity metals under
Ti-gettered Argon atmosphere. In addition, these ingots were re-melted four times respectively, in order to be homogeneous alloys. Then, these samples, ribbons with width of 3mm were prepared by single copper roller melt spinning machine in 39.27m/s. After processing of ribbons, we identified ribbons' thermal and magnetic property by multiple measuring equipment. The structure of amorphous is confirmed by X-ray diffraction (XRD). We conducted an analysis of the results by differential scanning calorimeter (DSC)) to identify the thermal properties such as the crystallization temperature (Tx). The saturation magnetization (Ms) at room temperature was measured
by vibrating sample magnetometer(VSM) with a maximum applied field of 800kAm-1.
3. Result and discussion
In this research, we performed diverse study on Co-Fe-B-Si-Mo system in order to identify that adding Mo element enhances glass-forming ability and thermal stability. Also we want to study into the thermal and the magnetic properties for Co-Fe based amorphous alloys with Mo in depth. (Co1-xFex)72B19.2Si4.8Mo4 (0≤x≤1)
amorphous ribbons showed the crystallization temperature (Tx) were decreased with decreased the ratio of Co.
Furthermore, the amorphous ribbons of these composition exhibited good soft magnetic properties. Thus Fe/Co ratio in (Co1-xFex)72B19.2Si4.8Mo4 alloys will be related with the thermal stability and soft magnetic properties and
the addition of a small quantity of Mo have beneficial effects on magnetic properties.
4. References
[1] A. Inoue, B. L. Shen, and C. T. Chang, Acta Mate. 52, 4093 (2004). [2] B. L. Shen, A. Inoue, and C. T. Chang, Appl. phys. Lett. 85, 4911 (2004).
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-[3] B. L. Shen, C. T. Chang, T. Kubota, and A. Inoue, J. Appl. phys. 100, 013515 (2006). [4] A. Inoue and A. Makino, Nano. Mater. 9, 403 (1997).
[5] A. Inoue, Mater. Sci. Eng. 304, 1 (2001).
[6] K. Hayashi, M. Hayakawa, Y. Ochiai, H. Matsuda, W. Ishikawa, and K. Aso, J. Appl. Phys. 61, 2983 (1987).
[7] A. Datta and C. H. Smith, Rapidly Quenched Metals, vol. eds. S. Steeb and H. Warlimont, North-Holland, Amster-dam, Oxford, New York, Tokyo (1985), p. 1315.
